莫队的失败

if(now_r<ask[i].r) add_r(++now_r);
if(now_r>ask[i].r) del_r(now_r--);
if(now_l<ask[i].l) del_l(now_l++);
if(now_l>ask[i].l) add_l(--now_l);

手残一时爽，赛后泪千行
按理说O(n*sqrt(n))过不了5e5的（雾